Panasonic IMAGECHECKER PV230 Manual page 40

Using Character Recognition Rate
This is set for using the recognition rate of recognized characters. The recognition rate is calculated by
comparing recognized characters to dictionary characters.
1.
Select a method from "No", "Correlation
Value", "Subtraction", "Max.", "Min." or
"Average in "Recognition rate method".
Default: "No"
How to calculate
No Not calculate the recognition rate.
Calculates the recognition rate from the correlation value (similarity
Correlation degree) between recognized characters and dictionary data.
Value When multiple dictionary data is registered, the maximum value of them
is output.
Performs subtraction with dictionary data (comparing the gray values
between dictionary data and detected characters and extracting pixels
that shows the difference in the grayscale value of subtraction
Subtraction
threshold), and calculates the recognition rate from the result.
When multiple dictionary data is registered, the maximum value of them
is output.
The maximum value calculated from the correlation value between
Max. recognized characters and dictionary data and the result of subtraction
is treated as the recognition rate.
The minimum value calculated from the correlation value between
Min. recognized characters and dictionary data and the result of subtraction
is treated as the recognition rate.
The averaged value calculated from the correlation value between
Average recognized characters and dictionary data and the result of subtraction
is treated as the recognition rate.
The recognition rate is the integer between 0 to 100. When a recognized
character is the same as dictionary data, the recognition rate is 100.
Subtraction
With this setting, tiny defects of
characters can be defected more than
Correlation which detects a defect using
the similarity degree of whole characters.
2.
Select a method from "Details Mode",
"Rough+Details Mode" or "Rought". Select the
comparative accuracy between recognized
characters and dictionary data. In case of
"Rough+Details Mode", the higher recognition
rate is output after the calculations with
"Detailed Mode" and "Rougth".
Default: "Detailed Mode"
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Dictionary image Inspection image Subtraction result